arkei | 7626e47624b6d66f33395c1c0febb9d8f2c8eb9197ad4eda6c61f86f8660b7b8

General

Target

a5a77a06940cb5c8933934b8c9e4ac27.exe
Size

364KB
MD5

a5a77a06940cb5c8933934b8c9e4ac27
SHA1

a4d0bebefcbef7b718acd9f2e69a9b7767213a51
SHA256

7626e47624b6d66f33395c1c0febb9d8f2c8eb9197ad4eda6c61f86f8660b7b8
SHA512

dcaaabc990fd6f971810887a27cd7204bf5cc3cd16e7f4ac0712e41a277051980a079f4b9ea181d1d4509aa56b6b74d454ad2877b50e67029080adb79e7a5aad

Score

10^/10

arkei default discovery spyware stealer

Malware Config

Extracted

Family

arkei

Botnet

Default

Signatures

Arkei
Arkei is an infostealer written in C++.
stealer arkei
Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1004 cmd.exe
Loads dropped DLL 2 IoCs

Processes:

a5a77a06940cb5c8933934b8c9e4ac27.exe

pid process

1448 a5a77a06940cb5c8933934b8c9e4ac27.exe
1448 a5a77a06940cb5c8933934b8c9e4ac27.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
Suspicious use of SetThreadContext 1 IoCs

Processes:

a5a77a06940cb5c8933934b8c9e4ac27.exe

description pid process target process

PID 1932 set thread context of 1448 1932 a5a77a06940cb5c8933934b8c9e4ac27.exe a5a77a06940cb5c8933934b8c9e4ac27.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
1004	cmd.exe

pid	process
1448	a5a77a06940cb5c8933934b8c9e4ac27.exe
1448	a5a77a06940cb5c8933934b8c9e4ac27.exe

description	pid	process	target process
PID 1932 set thread context of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

a5a77a06940cb5c8933934b8c9e4ac27.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	a5a77a06940cb5c8933934b8c9e4ac27.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	a5a77a06940cb5c8933934b8c9e4ac27.exe

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

1972 timeout.exe

pid	process
1972	timeout.exe

Suspicious use of WriteProcessMemory 19 IoCs

Processes:

a5a77a06940cb5c8933934b8c9e4ac27.exea5a77a06940cb5c8933934b8c9e4ac27.execmd.exe

description	pid	process	target process
PID 1932 wrote to memory of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe
PID 1932 wrote to memory of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe
PID 1932 wrote to memory of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe
PID 1932 wrote to memory of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe
PID 1932 wrote to memory of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe
PID 1932 wrote to memory of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe
PID 1932 wrote to memory of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe
PID 1932 wrote to memory of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe
PID 1932 wrote to memory of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe
PID 1932 wrote to memory of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe
PID 1932 wrote to memory of 1448	1932	a5a77a06940cb5c8933934b8c9e4ac27.exe	a5a77a06940cb5c8933934b8c9e4ac27.exe
PID 1448 wrote to memory of 1004	1448	a5a77a06940cb5c8933934b8c9e4ac27.exe	cmd.exe
PID 1448 wrote to memory of 1004	1448	a5a77a06940cb5c8933934b8c9e4ac27.exe	cmd.exe
PID 1448 wrote to memory of 1004	1448	a5a77a06940cb5c8933934b8c9e4ac27.exe	cmd.exe
PID 1448 wrote to memory of 1004	1448	a5a77a06940cb5c8933934b8c9e4ac27.exe	cmd.exe
PID 1004 wrote to memory of 1972	1004	cmd.exe	timeout.exe
PID 1004 wrote to memory of 1972	1004	cmd.exe	timeout.exe
PID 1004 wrote to memory of 1972	1004	cmd.exe	timeout.exe
PID 1004 wrote to memory of 1972	1004	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\a5a77a06940cb5c8933934b8c9e4ac27.exe
"C:\Users\Admin\AppData\Local\Temp\a5a77a06940cb5c8933934b8c9e4ac27.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1932
- C:\Users\Admin\AppData\Local\Temp\a5a77a06940cb5c8933934b8c9e4ac27.exe
  "C:\Users\Admin\AppData\Local\Temp\a5a77a06940cb5c8933934b8c9e4ac27.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1448
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\a5a77a06940cb5c8933934b8c9e4ac27.exe" & exit
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:1004
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 5
      4⤵
      Delays execution with timeout.exe
      PID:1972

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

2

T1081

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\ProgramData\mozglue.dll

Filesize
133KB

MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
\ProgramData\nss3.dll

Filesize
1.2MB

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
memory/1004-84-0x0000000000000000-mapping.dmp

Download
memory/1448-61-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download
memory/1448-59-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download
memory/1448-60-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download
memory/1448-54-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download
memory/1448-62-0x0000000076281000-0x0000000076283000-memory.dmp

Filesize
8KB

Download
memory/1448-63-0x0000000060900000-0x0000000060992000-memory.dmp

Filesize
584KB

Download
memory/1448-55-0x000000000043C0B2-mapping.dmp

Download
memory/1448-85-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download
memory/1932-58-0x0000000000220000-0x000000000024A000-memory.dmp

Filesize
168KB

Download
memory/1932-56-0x000000000052C000-0x000000000054D000-memory.dmp

Filesize
132KB

Download
memory/1972-86-0x0000000000000000-mapping.dmp

Download

Analysis

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